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华南沿海黄色粉土石英颗粒的扫描电镜特及其对成因的指示

王 晶，陈 震
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2020年 第39卷 第4期: 1000-6281（2020）04-0370-07     下载地址：

华南沿海黄色粉土石英颗粒的扫描电镜特及其对成因的指示

王  晶1，陈  震2

（中山大学1.地理科学与规划学院；2.地球科学与工程学院，广东 广州  510275）

摘  要   对华南沿海地区黄色粉土剖面中的石英颗粒进行扫描电镜观测，并与混杂在粉土层中的基岩风化残余石英颗粒进行对比：黄色粉土的石英颗粒以次棱角状-次圆状为主，多发育碟形撞击坑、麻面，并伴有一定的化学溶蚀及化学沉淀现象，指示风成成因；黄褐色粉土夹层中的石英颗粒表面化学结构更为发育，表明该阶段气候环境更为湿热，粉土经历了强烈的风化成壤作用。而基岩残积石英颗粒粒度粗大、棱角鲜明、贝壳状断口及新鲜断面发育，与黄色粉土中的石英颗粒所反映的成因类型、搬运动力及沉积环境存在较大差异。在以往对黄色粉土理化特征研究的基础上，本文主要采用扫描电镜观测的方法，从石英颗粒形态特征和表面结构的角度，为黄色粉土的风成成因提供了新的证据。

关键词   扫描电镜；黄色粉土；石英颗粒；风成沉积；华南沿海

中图分类号： P512.2+1  文献标识码：A  doi:10.3969/j.issn.1000-6281.2020.04.005

 

SEM study of quartz grains of yellow silt in the coastal area of South China and the interpretationof its origin

WANG Jing1, CHEN Zhen2

( 1. School of Geography and Planning, Sun Yat-Sen University; 2.School of Earth Science and Engineering, Sun Yat-Sen University, Guangzhou Guangdong 510275, China)

Abstract   Scanning electron microscope (SEM) observation of quartz grains of yellow silt deposited in the coastal area of south China represented by Jin Shuitai section in central Guangdong province is compared with that of the quartz grains of weathered bedrock residuals mixed within the yellow silt layer. The morphological characters and surfacetextures of quartz grains of the studied yellow silt show clearly subangulartosubrounded shape, pitting surface and collision pits, which are typical aeolian evidences. Chemical denudation and chemical precipitation on the quartz grains of reddish-brown silt interlayer are more developed indicating a stronger weathering pedogenesis. The coarse residual quartz grains show sharp edges, poor sphericity, irregular shapes and well-developed conchoidal fractures, which is quite different from the quartz grains of the yellow silt in transportation agent and sedimentary environment. Based on the physicochemical characteristics of the yellow silt in previous study and the morphological characters and surface textures of the quartz grains in this study, a new evidence for aeolian origin of the yellow silt is provided in this paper.

Keywords   SEM; yellow silt; quartz grains; aeolian deposit; South China coastal area

 

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